i first want to know why you have hardly stayed with him. was there some problem and you wanted to stay away?
him being anxious about his ex could mean that he is concerned about her, and even if it is just as friends, it could also be possible that he may be interested in her, as you think.
i think if he is living on his own, it is obvious that he is lonely and would want someone to talk to or connect to. if you are not able to spend time with him, he definitely can look for friendships elsewhere. why don't you go and live together as a family?
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